Fix quote block font-weight inconsistency in Twenty Twenty theme #13036

Job	Run time
Core running from build / Core running from build / Linux	2m 5s
Core running from src / Core running from src / Linux	1m 58s
Core running from build / Core running from build / Windows	3m 54s
Core running from src / Core running from src / Windows	3m 45s
Core running from src / Core running from src / MacOS	1m 49s
Core running from build / Core running from build / MacOS	1m 44s
Gutenberg running from build / Gutenberg running from build / Linux	8m 39s
Gutenberg running from src / Gutenberg running from src / Linux	8m 28s
Gutenberg running from build / Gutenberg running from build / Windows	12m 2s
Gutenberg running from src / Gutenberg running from src / Windows	12m 25s
Gutenberg running from build / Gutenberg running from build / MacOS	9m 10s
Gutenberg running from src / Gutenberg running from src / MacOS	8m 31s
Slack Notifications	0s
Failed workflow tasks	0s
	1h 14m 30s

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